# operator+,-(ranges::stride_view::iterator)

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< cpp‎ | ranges‎ | stride view‎ | iterator

friend constexpr /*iterator*/ operator+( const /*iterator*/& i, difference_type n ) requires ranges::random_access_range<Base>; | (1) | (since C++23)
friend constexpr /*iterator*/ operator+( difference_type n, const /*iterator*/& i ) requires ranges::random_access_range<Base>; | (2) | (since C++23)
friend constexpr /*iterator*/ operator-( const /*iterator*/& i, difference_type n ) requires ranges::random_access_range<Base>; | (3) | (since C++23)
friend constexpr difference_type operator-( const /*iterator*/& x, const /*iterator*/& y ) requires std::sized_sentinel_for<ranges::iterator_t<Base>, ranges::iterator_t<Base>>; | (4) | (since C++23)
friend constexpr difference_type operator-( std::default_sentinel_t, const /*iterator*/& x ) requires std::sized_sentinel_for<ranges::sentinel_t<Base>, ranges::iterator_t<Base>>; | (5) | (since C++23)
friend constexpr difference_type operator-( const /*iterator*/& x, std::default_sentinel_t s ) requires std::sized_sentinel_for<ranges::sentinel_t<Base>, ranges::iterator_t<Base>>; | (6) | (since C++23)

Increments or decrements the iterator.

Let `current_`, `end_`, `stride_`, and `missing_` be the data members of the iterator.

1,2) Equivalent to auto r = i; r += n; return r;.
3) Equivalent to auto r = i; r -= n; return r;.
4) Let `N` be x.current_ - y.current_. Returns:

- (N + x.missing_ - y.missing_) / x.stride_, if `Base` models `forward_range`.
- -/*div-ceil*/(-N, x.stride_), if `N < 0`.
- /*div-ceil*/(N, x.stride_) otherwise.

5) Equivalent to return /*div-ceil*/(x.end_ - x.current_, x.stride_);.
6) Equivalent to return -(s - x);.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when `stride_view::iterator<Const>` is an associated class of the arguments.

### Parameters

x, y, i | - | the iterators
s | - | a sentinel

### Return value

1,2) An incremented iterator
3) A decremented iterator
4) A distance between given iterators
5,6) A distance between given iterator and sentinel

### Example

| This section is incomplete Reason: no example

### See also

operator++operator++(int)operator--operator--(int)operator+=operator-= | advances or decrements the underlying iterator (public member function)

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